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 for EIA-232
From The Free On-line Dictionary of Computing (30 December 2018) :

      (Formerly "RS-232") The most common
     asynchronous serial line standard.  EIA-232 is the EIA
     equivalent of ITU-T V.24, and V.28.
     EIA-232 specifies the gender and pin use of connectors, but
     not their physical type.  RS-423 specifies the electrical
     signals.  25-way D-type connectors are common but often only
     three wires are connected - one ground (pin 7) and one for
     data in each direction.  The other pins are primarily related
     to hardware handshaking between sender and receiver and to
     carrier detection on modems, inoperative circuits, busy
     conditions etc.
     The standard classifies equipment as either Data
     Communications Equipment (DCE) or Data Terminal Equipment
     (DTE).  DTE receives data on pin 3 and transmits on pin 2
     (TD).  A DCE EIA-232 interface has a female connector.  DCE
     receives data from DTE on pin 2 (TD) and sends that data out
     the analog line.  Data received from the analog line is sent
     by the DCE on pin 3(RD).
     Originally DCE was a modem and DTE was a computer or terminal.
     The terminal or computer was connected (via EIA-232) to two
     modems, which were connected via a telephone line.
     The above arrangement allows a computer or terminal to be
     connected to a modem with a straight-through (2-2, 3-3) cable.
     It is common, however, to find equipment with the wrong sex
     connector or with pins two and three reversed, requiring the
     insertion of a cable or adaptor wired as a gender mender or
     null modem.  Such an adaptor is also required when
     connecting a computer directly to a terminal or to another
     computer without the use of modems.

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